CDF level 2 trigger upgrade Anikeev, K.; Bogdan, M.; Demaat, R. ...
IEEE transactions on nuclear science,
04/2006, Letnik:
53, Številka:
2
Journal Article
Recenzirano
Odprti dostop
We describe the new CDF Level 2 Trigger, which was commissioned during Spring 2005. The upgrade was necessitated by several factors that included increased bandwidth requirements, in view of the ...growing instantaneous luminosity of the Tevatron, and the need for a more robust system, since the older system was reaching the limits of maintainability. The challenges in designing the new system were interfacing with many different upstream detector subsystems, processing larger volumes of data at higher speed, and minimizing the impact on running the CDF experiment during the system commissioning phase. To meet these challenges, the new system was designed around a general purpose motherboard, the PULSAR, which is instrumented with powerful FPGAs and modern SRAMs, and which uses mezzanine cards to interface with upstream detector components and an industry standard data link (S-LINK) within the system.
The Online Silicon Vertex Tracker (SVT) is a new trigger processor dedicated to the 2-D reconstruction of charged particle trajectories at Level 2 of the CDF trigger. The SVT links the digitized ...pulse heights found within the Silicon Vertex detector to the tracks reconstructed in the Central Outer Tracker by the Level 1 Fast Track finder. The SVT was recently modified in order to increase its efficiency. The new configuration uses all the Silicon Vertex detector layers. On the other hand the processing time has increased. This can be a problem at higher luminosities of the Tevatron. The "Road Warrior" is a new board that eliminates redundant track candidates before Track Fitting. It is based on the principle of the Associative Memory. The algorithm used is described in the paper, as well as the hardware implementation.
The Liquid Argon Jet Trigger of the H1 Experiment at HERA Olivier, B.; Dubak-Behrendt, A.; Kiesling, C. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
2010, Letnik:
à paraître
Journal Article
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We report on a novel trigger for the liquid argon calorimeter which was installed in the H1 Experiment at HERA.This trigger, called the “Jet Trigger”, was running at level 1 and implemented a ...real-time cluster algorithm. Within only 800 ns, the Jet Trigger algorithm found local energy maxima in the calorimeter, summed their immediate neighbors, sorted the resulting jets by energy, and applied topological conditions for the final level 1 trigger decision. The Jet Trigger was in operation from the year 2006 until the end of the HERA running in the summer of 2007. With the Jet Trigger it was possible to substantially reduce the thresholds for triggering on electronsand jets, giving access to a largely extended phase space for physical observables which could not have been reached in H1 before. The concepts of the Jet Trigger may be an interesting upgrade option for the LHC experiments.
The Online Silicon Vertex Tracker (SVT) is a new trigger processor dedicated to the 2-D reconstruction of charged particle trajectories at the level 2 of the CDF trigger. The SVT links the digitized ...pulse heights found within the Silicon Vertex Detector to the tracks reconstructed in the Central Outer Tracker by the level 1 Fast Track Finder. The SVT was recently modified in order to increase its efficiency. The new configuration uses all the Silicon Vertex detector layers. On the other hand the processing time has increased. This can be a problem at higher luminosities of the Tevatron. The "Road Warrior" is a new board that, eliminates redundant track candidates before the Track Fitting. It is based on the principle of the Associative Memory. The algorithm used is described in the paper, as well as the hardware implementation.
The CDF data acquisition and trigger system is being upgraded to significantly increase the bandwidth for the upcoming high luminosity running of the Tevatron Collider (run IIb). This paper focuses ...on the upgrade for the level 2 (L2) trigger decision crate. This crate is at the heart of the L2 trigger system and has to interface with many different subsystems both upstream and downstream. The challenge of this upgrade is to have a uniform design to be able to interface with many different data paths upstream, merge and process the data at high speed for fast L2 trigger decision making, and minimize the impact on the running CDF experiment during the commissioning phase. In order to meet this challenge, the design philosophy of the upgrade is to use one type of general purpose motherboard, with a few powerful modern FPGAs and SRAMs, to interface any user data with any industrial standard link through the use of mezzanine cards. This general purpose motherboard, named "Pulsar" (PULSer And Recorder), is fully self-testable at board level as well as at system level. CERN S-LINK is chosen to allow Pulsar to communicate with commodity processors via high bandwidth, low latency S-LINK-to-PCI cards. Knowledge gained by using S-LINK at CDF will be transferable to and from the LHC community.
The Silicon Vertex Trigger (SVT) provides the CDF experiment with a powerful tool for fast and precise track finding and fitting at trigger level. The system enhances the experiment's reach on ...B-physics and large
P
T
-physics coupled to b quarks. We review the main design features and the performance of the SVT with particular attention to the recent upgrade that improved its capabilities. Finally, we will focus on additional improvements of the functionality of such a system in a more general experimental context.
Real time secondary vertexing at CDF Adelman, J.; Annovi, A.; Aoki, M. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
12/2006, Letnik:
569, Številka:
1
Journal Article
Recenzirano
Odprti dostop
The Online Silicon Vertex Tracker (SVT) is the trigger processor dedicated to the 2-D reconstruction of charged particle trajectories at the Level 2 of the CDF trigger. As the Tevatron luminosity ...rises, multiple interactions increase the complexity of events and thus the SVT processing time, reducing the amount of data CDF can record. The SVT upgrade aims to increase the SVT processing power to restore at high luminosity the original CDF Data Acquisition capability. In this paper we review the tracking algorithms implemented in the SVT and we report on the first step in the SVT upgrade.
Charm Production Studies at CDF Reisert, B.
Nuclear physics. Section B, Proceedings supplement,
08/2007, Letnik:
170
Journal Article
The upgraded Collider Detector at Fermilab (CDF II) has a high bandwidth available for track based triggers. This capability, in conjunction with an integrated luminosity in excess of
1
fb
−1
, ...enables detailed studies of charm hadron production. CDF is now releasing first measurements of the prompt charm meson pair cross-sections, which give access to QCD mechanisms by which charm quarks are produced in proton anti-proton collisions. Recent results on the spin alignment of
J
/
ψ
and
ψ
(
2
S
)
as well as on the relative production of the
χ
c
1
(
P
1
)
and
χ
c
2
(
1
P
)
challenge our understanding of the fragmentation of charm quarks into charmonium states.
Cross section measurement at high Q2 Reisert, B.
Nuclear physics. Section B, Proceedings supplement,
10/1999, Letnik:
79, Številka:
1
Journal Article
The inclusive single and double differential cross sections for neutral and charged current processes with four-momentum transfer squared
Q
2 between 150 and 30000 GeV
2 are measured with the H1 ...detectors at HERA. Data on
e
+
p interactions have been collected from 1994-97 and correspond to an integrated luminosity of about 36 pb
−1. Preliminary
e
−
p results are based on data collected in 1998 and beginning 1999 with an integrated luminosity of 5.6 pb
−1. Predictions of the electroweak theory are confronted with the data. No significant deviation from the Standard Model has been found. The consistency of the theoretical expectation with the data is expressed by the measured mass of the
W boson and by the observed difference in
e
−
p and
e
+
p neutral current cross-sections at high
Q
2 due to βZ interference.
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